Notes of Chapter 02: Vectors and Equilibrium of “Physics XI” for FSc Part 1 published by Punjab Textbook Board, Lahore. These notes are very helpful to prepare Physics paper of FSc Part 1 for Federal Board, Multan Board, Faisalabad Board, Sargodha Board, Gujranwala Board, DG Khan Board, Rawalpindi Board or any other board of Punjab, Pakistan.

#### Summary and Contents:

The physical quantities that are completely described by magnitude with proper unit are called scalars.The physical quantities that are completely described by magnitude with proper unit and direction are called vectors.

• Basic Concept of vectors.
• Vectors.
• Rectangular Coordinate system.
• Resultant Vectors.
• Vectors Subtraction.
• Multiplication of a Vector with a Scalar.
• Unit Vector.
• Null Vector.
• Equal Vectors.
• Rectangular Components of a Vector.
• Determination of a Vector from its Rectangular Components.
• Position Vector.
• Vector Addition by Rectangular Components.
• Product of two Vectors.
• Vector or Cross Product.
• Torque.
• Equilibrium of Forces.
• First Condition of Equilibrium.
• Second Condition of Equilibrium.